What’s the difference between the unit scale and the product scale?

In the case of the unit scale each heat cost allocator is programmed with the same K-values. When the bill is drawn up the displayed value is multiplied by the evaluation factors of the radiator, which are also calculated. The valuation factor depends on the heating output of the radiator, the type of radiator and type of assembly, details of which are printed on the bill. The total of the calculated values appear on the bill as a consumption unit. In the case of the product scale each heat cost allocator is already programmed with the K value for the radiator. The values displayed on the bill are the same as the values on the heat cost allocator.